Part 27: A Friend in NeedPart XXVII: A Friend in Need
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Whereupon Edward Kenway, after the fall of his friends Calico Jack and Charles Vane, seeks to ensure his eternal friendship with one Milo van der Graff, who has found himself afoul of the British and Spanish Empires. Kenway must assist his friend in these last desperate hours of his innocent trading career. That breathy guy clings to this video like a barnacle alongside me.
It's too bad the guy doesn't show up as a unique NPC model on the ship after the final mission. It would have also been cool if the game would have let you add The Hollander to Kenway's Fleet, but alas, you cannot.